mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 21:26:39 +07:00
af901ca181
That is "success", "unknown", "through", "performance", "[re|un]mapping" , "access", "default", "reasonable", "[con]currently", "temperature" , "channel", "[un]used", "application", "example","hierarchy", "therefore" , "[over|under]flow", "contiguous", "threshold", "enough" and others. Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
450 lines
11 KiB
C
450 lines
11 KiB
C
/*
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* Copyright (C) 2001-2006 Silicon Graphics, Inc. All rights
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* reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License
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* as published by the Free Software Foundation.
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*/
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/*
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* SN Platform Special Memory (mspec) Support
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*
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* This driver exports the SN special memory (mspec) facility to user
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* processes.
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* There are three types of memory made available thru this driver:
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* fetchops, uncached and cached.
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*
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* Fetchops are atomic memory operations that are implemented in the
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* memory controller on SGI SN hardware.
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*
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* Uncached are used for memory write combining feature of the ia64
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* cpu.
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*
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* Cached are used for areas of memory that are used as cached addresses
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* on our partition and used as uncached addresses from other partitions.
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* Due to a design constraint of the SN2 Shub, you can not have processors
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* on the same FSB perform both a cached and uncached reference to the
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* same cache line. These special memory cached regions prevent the
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* kernel from ever dropping in a TLB entry and therefore prevent the
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* processor from ever speculating a cache line from this page.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/miscdevice.h>
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#include <linux/spinlock.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/vmalloc.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/numa.h>
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#include <asm/page.h>
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#include <asm/system.h>
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#include <asm/pgtable.h>
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#include <asm/atomic.h>
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#include <asm/tlbflush.h>
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#include <asm/uncached.h>
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#include <asm/sn/addrs.h>
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#include <asm/sn/arch.h>
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#include <asm/sn/mspec.h>
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#include <asm/sn/sn_cpuid.h>
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#include <asm/sn/io.h>
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#include <asm/sn/bte.h>
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#include <asm/sn/shubio.h>
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#define FETCHOP_ID "SGI Fetchop,"
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#define CACHED_ID "Cached,"
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#define UNCACHED_ID "Uncached"
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#define REVISION "4.0"
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#define MSPEC_BASENAME "mspec"
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/*
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* Page types allocated by the device.
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*/
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enum mspec_page_type {
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MSPEC_FETCHOP = 1,
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MSPEC_CACHED,
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MSPEC_UNCACHED
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};
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#ifdef CONFIG_SGI_SN
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static int is_sn2;
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#else
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#define is_sn2 0
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#endif
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/*
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* One of these structures is allocated when an mspec region is mmaped. The
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* structure is pointed to by the vma->vm_private_data field in the vma struct.
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* This structure is used to record the addresses of the mspec pages.
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* This structure is shared by all vma's that are split off from the
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* original vma when split_vma()'s are done.
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*
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* The refcnt is incremented atomically because mm->mmap_sem does not
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* protect in fork case where multiple tasks share the vma_data.
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*/
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struct vma_data {
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atomic_t refcnt; /* Number of vmas sharing the data. */
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spinlock_t lock; /* Serialize access to this structure. */
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int count; /* Number of pages allocated. */
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enum mspec_page_type type; /* Type of pages allocated. */
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int flags; /* See VMD_xxx below. */
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unsigned long vm_start; /* Original (unsplit) base. */
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unsigned long vm_end; /* Original (unsplit) end. */
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unsigned long maddr[0]; /* Array of MSPEC addresses. */
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};
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#define VMD_VMALLOCED 0x1 /* vmalloc'd rather than kmalloc'd */
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/* used on shub2 to clear FOP cache in the HUB */
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static unsigned long scratch_page[MAX_NUMNODES];
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#define SH2_AMO_CACHE_ENTRIES 4
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static inline int
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mspec_zero_block(unsigned long addr, int len)
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{
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int status;
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if (is_sn2) {
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if (is_shub2()) {
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int nid;
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void *p;
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int i;
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nid = nasid_to_cnodeid(get_node_number(__pa(addr)));
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p = (void *)TO_AMO(scratch_page[nid]);
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for (i=0; i < SH2_AMO_CACHE_ENTRIES; i++) {
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FETCHOP_LOAD_OP(p, FETCHOP_LOAD);
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p += FETCHOP_VAR_SIZE;
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}
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}
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status = bte_copy(0, addr & ~__IA64_UNCACHED_OFFSET, len,
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BTE_WACQUIRE | BTE_ZERO_FILL, NULL);
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} else {
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memset((char *) addr, 0, len);
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status = 0;
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}
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return status;
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}
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/*
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* mspec_open
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*
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* Called when a device mapping is created by a means other than mmap
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* (via fork, munmap, etc.). Increments the reference count on the
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* underlying mspec data so it is not freed prematurely.
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*/
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static void
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mspec_open(struct vm_area_struct *vma)
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{
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struct vma_data *vdata;
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vdata = vma->vm_private_data;
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atomic_inc(&vdata->refcnt);
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}
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/*
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* mspec_close
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*
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* Called when unmapping a device mapping. Frees all mspec pages
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* belonging to all the vma's sharing this vma_data structure.
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*/
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static void
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mspec_close(struct vm_area_struct *vma)
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{
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struct vma_data *vdata;
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int index, last_index;
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unsigned long my_page;
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vdata = vma->vm_private_data;
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if (!atomic_dec_and_test(&vdata->refcnt))
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return;
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last_index = (vdata->vm_end - vdata->vm_start) >> PAGE_SHIFT;
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for (index = 0; index < last_index; index++) {
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if (vdata->maddr[index] == 0)
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continue;
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/*
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* Clear the page before sticking it back
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* into the pool.
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*/
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my_page = vdata->maddr[index];
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vdata->maddr[index] = 0;
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if (!mspec_zero_block(my_page, PAGE_SIZE))
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uncached_free_page(my_page, 1);
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else
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printk(KERN_WARNING "mspec_close(): "
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"failed to zero page %ld\n", my_page);
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}
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if (vdata->flags & VMD_VMALLOCED)
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vfree(vdata);
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else
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kfree(vdata);
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}
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/*
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* mspec_fault
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*
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* Creates a mspec page and maps it to user space.
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*/
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static int
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mspec_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
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{
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unsigned long paddr, maddr;
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unsigned long pfn;
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pgoff_t index = vmf->pgoff;
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struct vma_data *vdata = vma->vm_private_data;
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maddr = (volatile unsigned long) vdata->maddr[index];
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if (maddr == 0) {
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maddr = uncached_alloc_page(numa_node_id(), 1);
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if (maddr == 0)
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return VM_FAULT_OOM;
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spin_lock(&vdata->lock);
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if (vdata->maddr[index] == 0) {
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vdata->count++;
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vdata->maddr[index] = maddr;
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} else {
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uncached_free_page(maddr, 1);
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maddr = vdata->maddr[index];
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}
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spin_unlock(&vdata->lock);
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}
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if (vdata->type == MSPEC_FETCHOP)
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paddr = TO_AMO(maddr);
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else
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paddr = maddr & ~__IA64_UNCACHED_OFFSET;
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pfn = paddr >> PAGE_SHIFT;
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/*
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* vm_insert_pfn can fail with -EBUSY, but in that case it will
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* be because another thread has installed the pte first, so it
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* is no problem.
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*/
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vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn);
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return VM_FAULT_NOPAGE;
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}
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static const struct vm_operations_struct mspec_vm_ops = {
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.open = mspec_open,
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.close = mspec_close,
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.fault = mspec_fault,
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};
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/*
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* mspec_mmap
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*
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* Called when mmapping the device. Initializes the vma with a fault handler
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* and private data structure necessary to allocate, track, and free the
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* underlying pages.
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*/
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static int
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mspec_mmap(struct file *file, struct vm_area_struct *vma,
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enum mspec_page_type type)
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{
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struct vma_data *vdata;
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int pages, vdata_size, flags = 0;
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if (vma->vm_pgoff != 0)
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return -EINVAL;
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if ((vma->vm_flags & VM_SHARED) == 0)
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return -EINVAL;
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if ((vma->vm_flags & VM_WRITE) == 0)
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return -EPERM;
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pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
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vdata_size = sizeof(struct vma_data) + pages * sizeof(long);
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if (vdata_size <= PAGE_SIZE)
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vdata = kmalloc(vdata_size, GFP_KERNEL);
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else {
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vdata = vmalloc(vdata_size);
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flags = VMD_VMALLOCED;
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}
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if (!vdata)
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return -ENOMEM;
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memset(vdata, 0, vdata_size);
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vdata->vm_start = vma->vm_start;
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vdata->vm_end = vma->vm_end;
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vdata->flags = flags;
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vdata->type = type;
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spin_lock_init(&vdata->lock);
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vdata->refcnt = ATOMIC_INIT(1);
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vma->vm_private_data = vdata;
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vma->vm_flags |= (VM_IO | VM_RESERVED | VM_PFNMAP | VM_DONTEXPAND);
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if (vdata->type == MSPEC_FETCHOP || vdata->type == MSPEC_UNCACHED)
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vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
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vma->vm_ops = &mspec_vm_ops;
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return 0;
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}
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static int
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fetchop_mmap(struct file *file, struct vm_area_struct *vma)
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{
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return mspec_mmap(file, vma, MSPEC_FETCHOP);
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}
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static int
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cached_mmap(struct file *file, struct vm_area_struct *vma)
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{
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return mspec_mmap(file, vma, MSPEC_CACHED);
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}
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static int
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uncached_mmap(struct file *file, struct vm_area_struct *vma)
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{
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return mspec_mmap(file, vma, MSPEC_UNCACHED);
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}
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static const struct file_operations fetchop_fops = {
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.owner = THIS_MODULE,
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.mmap = fetchop_mmap
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};
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static struct miscdevice fetchop_miscdev = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "sgi_fetchop",
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.fops = &fetchop_fops
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};
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static const struct file_operations cached_fops = {
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.owner = THIS_MODULE,
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.mmap = cached_mmap
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};
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static struct miscdevice cached_miscdev = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "mspec_cached",
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.fops = &cached_fops
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};
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static const struct file_operations uncached_fops = {
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.owner = THIS_MODULE,
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.mmap = uncached_mmap
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};
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static struct miscdevice uncached_miscdev = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "mspec_uncached",
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.fops = &uncached_fops
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};
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/*
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* mspec_init
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*
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* Called at boot time to initialize the mspec facility.
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*/
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static int __init
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mspec_init(void)
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{
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int ret;
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int nid;
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/*
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* The fetchop device only works on SN2 hardware, uncached and cached
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* memory drivers should both be valid on all ia64 hardware
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*/
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#ifdef CONFIG_SGI_SN
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if (ia64_platform_is("sn2")) {
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is_sn2 = 1;
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if (is_shub2()) {
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ret = -ENOMEM;
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for_each_node_state(nid, N_ONLINE) {
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int actual_nid;
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int nasid;
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unsigned long phys;
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scratch_page[nid] = uncached_alloc_page(nid, 1);
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if (scratch_page[nid] == 0)
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goto free_scratch_pages;
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phys = __pa(scratch_page[nid]);
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nasid = get_node_number(phys);
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actual_nid = nasid_to_cnodeid(nasid);
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if (actual_nid != nid)
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goto free_scratch_pages;
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}
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}
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ret = misc_register(&fetchop_miscdev);
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if (ret) {
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printk(KERN_ERR
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"%s: failed to register device %i\n",
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FETCHOP_ID, ret);
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goto free_scratch_pages;
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}
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}
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#endif
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ret = misc_register(&cached_miscdev);
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if (ret) {
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printk(KERN_ERR "%s: failed to register device %i\n",
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CACHED_ID, ret);
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if (is_sn2)
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misc_deregister(&fetchop_miscdev);
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goto free_scratch_pages;
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}
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ret = misc_register(&uncached_miscdev);
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if (ret) {
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printk(KERN_ERR "%s: failed to register device %i\n",
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UNCACHED_ID, ret);
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misc_deregister(&cached_miscdev);
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if (is_sn2)
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misc_deregister(&fetchop_miscdev);
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goto free_scratch_pages;
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}
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printk(KERN_INFO "%s %s initialized devices: %s %s %s\n",
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MSPEC_BASENAME, REVISION, is_sn2 ? FETCHOP_ID : "",
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CACHED_ID, UNCACHED_ID);
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return 0;
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free_scratch_pages:
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for_each_node(nid) {
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if (scratch_page[nid] != 0)
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uncached_free_page(scratch_page[nid], 1);
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}
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return ret;
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}
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static void __exit
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mspec_exit(void)
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{
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int nid;
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misc_deregister(&uncached_miscdev);
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misc_deregister(&cached_miscdev);
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if (is_sn2) {
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misc_deregister(&fetchop_miscdev);
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for_each_node(nid) {
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if (scratch_page[nid] != 0)
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uncached_free_page(scratch_page[nid], 1);
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}
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}
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}
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module_init(mspec_init);
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module_exit(mspec_exit);
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MODULE_AUTHOR("Silicon Graphics, Inc. <linux-altix@sgi.com>");
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MODULE_DESCRIPTION("Driver for SGI SN special memory operations");
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MODULE_LICENSE("GPL");
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